For every profinite group G, we construct two covariant functors ∆G and APG from the category of commutative rings with identity to itself, and show that indeed they are equivalent to the functor WG introduced in [A. Dress and C. Siebeneicher, The Burnside ring of profinite groups and the Witt vectors construction, Adv. Math. 70 (1988), 87-132]. We call ∆G the generalized Burnside-Grothendieck ...

Methanotrophs are ubiquitous in soil, fresh water and the open ocean, but have not been well characterized in deep-sea hydrocarbon seeps and gas hydrates, where methane is unusually abundant. Here we report the presence of new functional genes for the aerobic oxidation of methane by methanotrophs in marine sediments associated with gas hydrates and hydrocarbon seeps in the Gulf of Mexico. Sampl...

Gas hydrates may play an important role in global climate change, carbon sequestration, energy production and seafloor stability. However, formation and dissociation pathways in geologically complex systems are poorly defined. We present a new approach to processing large amounts of data from a LUNA distributed sensing system (DSS) in the seafloor process simulator (SPS) at Oak Ridge National L...

Currently, natural gas hydrates (NGHs) have been proposed as promising and environmentally friendly carbon-based energy sources that are beneficial for mitigating the traditional crises [...]

The high-pressure structural behavior of the noble gas (Ng) clathrate hydrates $\mathrm{Ar}\ifmmode\cdot\else\textperiodcentered\fi{}6.5\phantom{\rule{0.16em}{0ex}}{\mathrm{H}}_{2}\mathrm{O}$ and $\mathrm{Xe}\ifmmode\cdot\else\textperiodcentered\fi{}7.2\phantom{\rule{0.16em}{0ex}}{\mathrm{H}}_{2}\mathrm{O}$ featuring cubic structures II I, respectively, was investigated by neutron powder diffra...

Проведен анализ современного состояния экспериментальных и теоретических исследований упругих свойств гидратосодержащих пористых сред. Сделан вывод о том, что во всех экспериментах установлена связь скоростей волн с содержанием гидрата в поровом пространстве, а именно, наблюдается рост увеличением гидратонасыщенности. В области созданы математические модели модулей сред, позволяющие качественно...